1#include "fetch.h"
2
3#include "cache.h"
4#include "commit.h"
5#include "tree.h"
6#include "tree-walk.h"
7#include "tag.h"
8#include "blob.h"
9#include "refs.h"
10
11const char *write_ref = NULL;
12const char *write_ref_log_details = NULL;
13
14int get_tree = 0;
15int get_history = 0;
16int get_all = 0;
17int get_verbosely = 0;
18int get_recover = 0;
19static unsigned char current_commit_sha1[20];
20
21void pull_say(const char *fmt, const char *hex)
22{
23 if (get_verbosely)
24 fprintf(stderr, fmt, hex);
25}
26
27static void report_missing(const char *what, const unsigned char *missing)
28{
29 char missing_hex[41];
30
31 strcpy(missing_hex, sha1_to_hex(missing));;
32 fprintf(stderr,
33 "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
34 what, missing_hex, sha1_to_hex(current_commit_sha1));
35}
36
37static int process(struct object *obj);
38
39static int process_tree(struct tree *tree)
40{
41 struct tree_desc desc;
42 struct name_entry entry;
43
44 if (parse_tree(tree))
45 return -1;
46
47 desc.buf = tree->buffer;
48 desc.size = tree->size;
49 while (tree_entry(&desc, &entry)) {
50 if (S_ISDIR(entry.mode)) {
51 struct tree *tree = lookup_tree(entry.sha1);
52 process_tree(tree);
53 } else {
54 struct blob *blob = lookup_blob(entry.sha1);
55 process(&blob->object);
56 }
57 }
58 free(tree->buffer);
59 tree->buffer = NULL;
60 tree->size = 0;
61 return 0;
62}
63
64#define COMPLETE (1U << 0)
65#define SEEN (1U << 1)
66#define TO_SCAN (1U << 2)
67
68static struct commit_list *complete = NULL;
69
70static int process_commit(struct commit *commit)
71{
72 if (parse_commit(commit))
73 return -1;
74
75 while (complete && complete->item->date >= commit->date) {
76 pop_most_recent_commit(&complete, COMPLETE);
77 }
78
79 if (commit->object.flags & COMPLETE)
80 return 0;
81
82 memcpy(current_commit_sha1, commit->object.sha1, 20);
83
84 pull_say("walk %s\n", sha1_to_hex(commit->object.sha1));
85
86 if (get_tree) {
87 if (process(&commit->tree->object))
88 return -1;
89 if (!get_all)
90 get_tree = 0;
91 }
92 if (get_history) {
93 struct commit_list *parents = commit->parents;
94 for (; parents; parents = parents->next) {
95 if (process(&parents->item->object))
96 return -1;
97 }
98 }
99 return 0;
100}
101
102static int process_tag(struct tag *tag)
103{
104 if (parse_tag(tag))
105 return -1;
106 return process(tag->tagged);
107}
108
109static struct object_list *process_queue = NULL;
110static struct object_list **process_queue_end = &process_queue;
111
112static int process_object(struct object *obj)
113{
114 if (obj->type == commit_type) {
115 if (process_commit((struct commit *)obj))
116 return -1;
117 return 0;
118 }
119 if (obj->type == tree_type) {
120 if (process_tree((struct tree *)obj))
121 return -1;
122 return 0;
123 }
124 if (obj->type == blob_type) {
125 return 0;
126 }
127 if (obj->type == tag_type) {
128 if (process_tag((struct tag *)obj))
129 return -1;
130 return 0;
131 }
132 return error("Unable to determine requirements "
133 "of type %s for %s",
134 obj->type, sha1_to_hex(obj->sha1));
135}
136
137static int process(struct object *obj)
138{
139 if (obj->flags & SEEN)
140 return 0;
141 obj->flags |= SEEN;
142
143 if (has_sha1_file(obj->sha1)) {
144 /* We already have it, so we should scan it now. */
145 obj->flags |= TO_SCAN;
146 } else {
147 if (obj->flags & COMPLETE)
148 return 0;
149 prefetch(obj->sha1);
150 }
151
152 object_list_insert(obj, process_queue_end);
153 process_queue_end = &(*process_queue_end)->next;
154 return 0;
155}
156
157static int loop(void)
158{
159 struct object_list *elem;
160
161 while (process_queue) {
162 struct object *obj = process_queue->item;
163 elem = process_queue;
164 process_queue = elem->next;
165 free(elem);
166 if (!process_queue)
167 process_queue_end = &process_queue;
168
169 /* If we are not scanning this object, we placed it in
170 * the queue because we needed to fetch it first.
171 */
172 if (! (obj->flags & TO_SCAN)) {
173 if (fetch(obj->sha1)) {
174 report_missing(obj->type
175 ? obj->type
176 : "object", obj->sha1);
177 return -1;
178 }
179 }
180 if (!obj->type)
181 parse_object(obj->sha1);
182 if (process_object(obj))
183 return -1;
184 }
185 return 0;
186}
187
188static int interpret_target(char *target, unsigned char *sha1)
189{
190 if (!get_sha1_hex(target, sha1))
191 return 0;
192 if (!check_ref_format(target)) {
193 if (!fetch_ref(target, sha1)) {
194 return 0;
195 }
196 }
197 return -1;
198}
199
200static int mark_complete(const char *path, const unsigned char *sha1)
201{
202 struct commit *commit = lookup_commit_reference_gently(sha1, 1);
203 if (commit) {
204 commit->object.flags |= COMPLETE;
205 insert_by_date(commit, &complete);
206 }
207 return 0;
208}
209
210int pull(char *target)
211{
212 struct ref_lock *lock;
213 unsigned char sha1[20];
214 char *msg;
215 int ret;
216
217 save_commit_buffer = 0;
218 track_object_refs = 0;
219 if (write_ref) {
220 lock = lock_ref_sha1(write_ref, NULL, 0);
221 if (!lock) {
222 error("Can't lock ref %s", write_ref);
223 return -1;
224 }
225 }
226
227 if (!get_recover)
228 for_each_ref(mark_complete);
229
230 if (interpret_target(target, sha1)) {
231 error("Could not interpret %s as something to pull", target);
232 unlock_ref(lock);
233 return -1;
234 }
235 if (process(lookup_unknown_object(sha1))) {
236 unlock_ref(lock);
237 return -1;
238 }
239 if (loop()) {
240 unlock_ref(lock);
241 return -1;
242 }
243
244 if (write_ref) {
245 if (write_ref_log_details) {
246 msg = xmalloc(strlen(write_ref_log_details) + 12);
247 sprintf(msg, "fetch from %s", write_ref_log_details);
248 } else
249 msg = NULL;
250 ret = write_ref_sha1(lock, sha1, msg ? msg : "fetch (unknown)");
251 if (msg)
252 free(msg);
253 return ret;
254 }
255 return 0;
256}